This is the vastest lava area of the country. The individual
lava fields date back to different ages, but all of them were
created during the Holocene. The total area of the Odadahraun is
about 6000 km² and all of it is the property of the farm
Reykjahlid on lake Myvatn. It is a part of the Icelandic Graben
and is very volcanically active. The natural phenomena described
under this title are either within or on the outskirts of the
area.

The area should only be accessed by 4wd vehicles or on foot.
Hikers should be aware of the lack of surface water in the lava
fields and bring along sufficient supplies of water. Hikers
should also plan their daily progress conservatively and use
maps rather than relying on their eyes, because the clear air
draws all landmarks closer than they really are.

There are very few vegetated oases in the area and the few huts
are not situated, where a day's hike is concluded every time.
Therefore it is necessary to bring tents along. Ancient routes
across this area have been discovered during the last few
decades. The whole area lies in the rain shadow of the icecap
Vatnajokull and the precipitation is minimal the whole year
round.